lapacke_chgeqz.c

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* Contents: Native high-level C interface to LAPACK function chgeqz
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_chgeqz( int matrix_layout, char job, char compq, char compz,
                           lapack_int n, lapack_int ilo, lapack_int ihi,
                           lapack_complex_float* h, lapack_int ldh,
                           lapack_complex_float* t, lapack_int ldt,
                           lapack_complex_float* alpha,
                           lapack_complex_float* beta, lapack_complex_float* q,
                           lapack_int ldq, lapack_complex_float* z,
                           lapack_int ldz )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    float* rwork = NULL;
    lapack_complex_float* work = NULL;
    lapack_complex_float work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_chgeqz", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_cge_nancheck( matrix_layout, n, n, h, ldh ) ) {
            return -8;
        }
        if( LAPACKE_lsame( compq, 'i' ) || LAPACKE_lsame( compq, 'v' ) ) {
            if( LAPACKE_cge_nancheck( matrix_layout, n, n, q, ldq ) ) {
                return -14;
            }
        }
        if( LAPACKE_cge_nancheck( matrix_layout, n, n, t, ldt ) ) {
            return -10;
        }
        if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
            if( LAPACKE_cge_nancheck( matrix_layout, n, n, z, ldz ) ) {
                return -16;
            }
        }
    }
#endif
    /* Allocate memory for working array(s) */
    rwork = (float*)LAPACKE_malloc( sizeof(float) * MAX(1,n) );
    if( rwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_chgeqz_work( matrix_layout, job, compq, compz, n, ilo, ihi, h,
                                ldh, t, ldt, alpha, beta, q, ldq, z, ldz,
                                &work_query, lwork, rwork );
    if( info != 0 ) {
        goto exit_level_1;
    }
    lwork = LAPACK_C2INT( work_query );
    /* Allocate memory for work arrays */
    work = (lapack_complex_float*)
        LAPACKE_malloc( sizeof(lapack_complex_float) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_chgeqz_work( matrix_layout, job, compq, compz, n, ilo, ihi, h,
                                ldh, t, ldt, alpha, beta, q, ldq, z, ldz, work,
                                lwork, rwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( rwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_chgeqz", info );
    }
    return info;
}